KR20180124409A - Apparatus and method for butt welding - Google Patents

Abstract

A butt welding apparatus and a method thereof are disclosed. According to an embodiment of the present invention, the butt welding apparatus has a stage on which each base material is mounted at both sides and a grip for fixing the base material on each stage so as to perform butt welding on two base materials. Specifically, the butt welding apparatus comprises: a laser sensor unit for measuring a vertical distance between a first base material and a second base material individually fixed to the stage; a height adjuster for adjusting the height by pushing the base material from the bottom through a slide bar; and a controller for controlling a vertical movement displacement of the slide bar, and controlling butt welding through a welding machine in order to correct a difference due to distance measurement between the first and second base materials.

Description

[0001] APPARATUS AND METHOD FOR BUTT WELDING [0002]

The present invention relates to a butt welding apparatus and a method thereof, and more particularly, to a butt welding apparatus and a method for joining cross sections of two steel plates aligned on a stage.

Generally, in a continuous line where a metal is processed by rolling to produce a coil in the form of a coil, or a product such as a steel sheet of an automobile is produced using the produced coil, two steel sheets (hereinafter referred to as " Butt welding apparatus for joining (connecting) business cards to each other.

For example, FIGS. 1 and 2 are cross-sectional views for explaining problems that occur during butt welding in a conventional welding process.

1 and 2, when the base material 1 and the base material 2 for the butt welding are seated on the welding stage, the base material is fixed through the pneumatic grip so as not to move, and then welding is performed using a welding machine .

However, it is pointed out that welding is performed in a state in which a difference in level between the base materials is generated because the height difference in the contact surface between the two base materials to be actually welded can not be precisely adjusted only by fixing the base material by gripping.

For example, FIG. 1 shows an example in which the shape of a cut surface machined in a shearing / slitting machine with a sheet of a size optimized for a blanking forming process of a product in a coil before a laser welding process is irregular, .

In addition, when the base materials having different thicknesses are welded as shown in FIG. 2, because the two base materials are welded to each other due to the difference in height of the cutting faces abutting each other, a welding failure occurs in which the penetration depth is less than the standard.

On the other hand, Fig. 3 shows a comparison between a good state and a poor state in the conventional butt welding.

3 (A), sufficient welding is performed on the contact surfaces between the two base materials in the case of good welding shown in FIG. 3 (A), while in FIG. 3 (B) Here is an example generated.

In the conventional welding apparatus, if the contact area between the two base materials is small, welding amount of the welding part becomes small, and weld defect, in which the strength of the welding part is lowered, is generated, which leads to defective mass product.

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

An embodiment of the present invention is to provide a butt welding apparatus and a method thereof for preventing weld defect by correcting the step between the base materials so that the contact area between two base materials positioned on the stage is maximized.

According to an aspect of the present invention, there is provided a butt welding apparatus including a stage on which a base material is seated on both sides and a grip for securing a base material to each stage, and a butt welding apparatus for welding the two base materials against each other, A laser sensor unit for measuring a vertical distance between the first base material and the second base material; A height adjuster for adjusting the height by pushing the base material from the bottom through the slide bar; And a controller for controlling the vertical movement displacement of the slide bar and controlling the butt welding through the welder in order to correct the step according to the distance measurement between the first and second base materials.

The laser sensor unit may include a first laser sensor and a second laser sensor that measure the distance from the base material by irradiating the laser onto the top surface of the base material and detecting a reflected signal.

The first laser sensor and the second laser sensor may be installed side by side at regular intervals on both sides of the welder moved along the welding line.

The height adjuster may further comprise: a slide bar; A motor for applying a rotational force to the rack formed at a lower portion of the slide bar through a pinion; And a displacement sensor for measuring the vertical movement displacement of the slide bar.

Further, the slide bar penetrates a slot on the stage formed at a position adjacent to the welding line from the bottom to push up the base material.

In addition, the displacement sensor may transmit a vertical displacement of the slide bar measured through a laser to the controller.

Further, the controller can calculate an average vertical distance of each base material based on the vertical distance between the first base material and the second base material adjacent to the welding line.

The controller may calculate the step correction amount for raising the base material relatively far away from the average vertical distance to drive the motor, and when the vertical movement displacement of the slide bar measured by the displacement sensor reaches the step correction amount, The motor can be stopped.

The step difference correction amount may be calculated so that the average distance of the relatively far away base material is located at a permissible distance within the step difference range set by the combination of the two base materials considering the thickness difference and the bent state of the first base material and the second base material have.

According to an aspect of the present invention, there is provided a butt welding method of a butt welding apparatus having a stage on which a base material is placed on both sides and a grip for fixing a base material on both sides, Measuring a vertical distance from a top surface of the first base material and the second base material, which are seated on the stage through the sensor portion, respectively; b) determining the height of the second base material that is relatively far from the average vertical distance by calculating an average vertical distance to the entire width of the base material based on the measured vertical distance; c) setting an allowable distance within a step range in which the cut surfaces of the two base materials abut each other considering the thickness and thickness difference of the base material; And d) controlling the vertical movement displacement of the slide bar to push up the second base material from below if the average vertical distance of the second base material is not within the allowable distance, so that the average vertical distance of the second base material To be located in the second region.

The step a) may include measuring the vertical distance while moving the laser sensor unit mounted on the welding machine along the welding line.

Also, the step c) may include calculating the allowable distance within the step difference range by further considering the average vertical distance, which is increased or decreased according to the bent state of at least one parent material.

Also, the step d) may include calculating a step correction amount of the slide bar for raising the average vertical distance of the second base material so as to be located at an intermediate value of the allowable distance.

The step d) may include driving the motor to raise the slide bar, and measuring a vertical movement displacement of the slide bar through the displacement sensor.

The step d) may include stopping the driving of the motor when the vertical movement displacement reaches the step difference correction amount, and transmitting the welding control signal to the welder to start welding.

According to the embodiment of the present invention, it is possible to correct the step difference so that the contact area between the two base materials fixed on the stage is maximized, so that sufficient welding is performed on the welding face, thereby preventing welding failure at the butt welding.

In addition, through the laser sensor, the allowable distance within the step range of the different combinations of the different base materials with different thicknesses or curved directions is calculated, and the step between the base materials is corrected on the basis of the allowable distance, so that the optimum welding can be performed corresponding to various base material environments .

In addition, even if the height deviation in the width direction of the base material occurs by calculating the step difference correction amount between the base materials based on the average vertical distance of the entire width of the base material, optimum welding is performed within the allowable range of the two base materials, And improve the performance of mass production products.

FIGS. 1 and 2 are cross-sectional views for explaining problems occurring during butt welding in a conventional welding process.
Fig. 3 shows a comparison between a good state and a poor state in the conventional butt welding.
4 schematically shows the construction of a butt welding apparatus according to an embodiment of the present invention.
FIG. 5 shows a vertical distance measuring state of each base material through a laser sensor unit according to an embodiment of the present invention.
6 is a view illustrating a state in which the height of the base material is adjusted through the height adjuster according to the embodiment of the present invention.
FIG. 7 shows a state in which height adjustment is not necessary because the vertical distance between two base materials is within a permissible distance with CASE # 1 according to the embodiment of the present invention.
FIG. 8 shows a state where the vertical distance between the two base materials exceeds the allowable distance by CASE # 2 according to the embodiment of the present invention and the height needs to be adjusted.
9 is a flowchart schematically illustrating a butt welding method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms " part, " " module, " and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

Now, a butt welding apparatus and a method thereof according to an embodiment of the present invention will be described in detail with reference to the drawings.

4 schematically shows the construction of a butt welding apparatus according to an embodiment of the present invention.

4, a butt welding apparatus 100 according to an embodiment of the present invention includes a stage 20 on which a base material 10 is placed on both sides, a base material 10 placed on a stage 20, The first base material 10-1 and the second base material 10-2 facing each other are formed symmetrically with respect to the welding line. Here, the welding line is a joint for butt welding of the first base material 10-1 on the right side and the second base material 10-2 on the left side, and means a welding path of the welding machine 140 .

Hereinafter, in describing the butt welding apparatus 100 according to the embodiment of the present invention, terms that are formed symmetrically with respect to the welding line are referred to as first and second Quot; In addition, in the case of a description which does not require distinction of right and left or a common description, the second and second terms can be omitted from the terminology.

The first base material 10-1 and the second base material 10-2 may have the same thickness or the same base material as the base material 10-2.

The stage 20 can be installed in a coil transfer line of a continuous process and includes a first base material 10-1 as a rear end of a preceding coil conveyed through a roller (not shown) and a second base material 10 -2) can be aligned side by side. The stage 20 is not limited to being applied to the continuous process, and may refer to all the workbenches for welding the base metal and the base metal.

The grip 30 is lowered to fix or elevate the base material 10 on the stage 20 to release the base material from the base material. The grip 30 may be a pneumatic grip that applies pressure to the top of the base material 10 by pneumatic pressure, but is not limited thereto and may be constituted by a clamp that applies pressure through an actuator or the like.

The butt welding apparatus 100 includes a laser sensor unit 110 for measuring a vertical distance between the buttocks 10-1 and 10-2 fixed to the left and right stages 20, The height adjuster 120 for adjusting the height by pushing up the base materials 10-1 and 10-2 from the bottom and the step difference according to the measurement heights of the first base material 10-1 and the second base material 10-2 And a controller 150 for controlling the displacement of the slide bar 121 and for controlling the butt welding through the welder 140.

Here, the welding machine 140 can be configured as a laser welding machine because the welding between the base material and the base material in the continuous line must proceed with a certain quality.

Further, the welding machine 140 is not limited to this, and may be constituted by an arc welder for instantly melting and fusing the wire and the coil by forming a strong current between the welding torch and the coil welding line while supplying the wire.

Although not shown in the figure, the welder 140 may be mounted on a conveying member moving up and down and left and right to perform butt welding while moving along a welding line between the two base materials 10-1 and 10-2.

The laser sensor unit 110 includes a first laser sensor 110-1 and a second laser sensor 110-2 which are arranged side by side at a predetermined interval on a welding line, And 10-2, respectively, to detect a reflected signal, thereby measuring a vertical distance from the base material.

The laser sensor unit 110 can measure the vertical distance d at a plurality of points along the cut length of the base material. To this end, the laser sensor unit 110 may measure the vertical distance d between the first and second sides of the welder 140, The laser sensor 110-1 and the second laser sensor 110-2 may be installed side by side. The first laser sensor 110-1 and the second laser sensor 110-2 can sense the vertical distance d of the plurality of points along the welding line movement of the welder 140 before commencing welding .

The vertical distance information measured by the laser sensor unit 110 with respect to the parent materials 10-1 and 10-2 may vary depending on the thickness of the parent material and the state of the parent material being curved, Is used as an index for adjusting the height of the light source.

FIG. 5 shows a vertical distance measuring state of each base material through a laser sensor unit according to an embodiment of the present invention.

5, the laser sensor unit 110 is provided with a first laser sensor 110-1 for measuring a vertical distance d1 between the laser sensor unit 110 and the upper surface of the first base material 10-1 through a laser, And a second laser sensor 110-1 for measuring the perpendicular distance d2 between the base material 10-2 and the upper surface.

In the following description, the vertical distance between the laser sensor and the base material is relatively far from the vertical distance between the laser sensor and the base material, which means that the height of the base material is lower or higher than that of the other base material.

When the vertical distance d between the laser sensor and the base material is gradually reduced when the height of the base material is adjusted, the height of the base material gradually increases toward the position of the laser sensor.

The first laser sensor 110-1 and the second laser sensor 110-2 are installed horizontally at the same height and measure vertical distance information d1 and d2 from the corresponding base material to the controller 150 .

For example, the first base material 10-1 in FIG. 5 is relatively thick and horizontal in thickness compared to the second base material 10-2, while the second base material 10-2 is thicker than the second base material 10-2, (D1 < d2), the vertical distance information between the base materials is different from each other (e.g., d1 &lt; d2).

Conventionally, there has been a problem of weld defect in which the vertical distance information of the respective base materials is different from each other and the welding amount is reduced in the state where the contact area between the base materials is reduced, so that the welding amount is reduced and the strength of the welding portion is lowered.

Therefore, the butt welding apparatus 100 according to the embodiment of the present invention raises the slide bar 121 at a position adjacent to a cutting edge (edge) where the two base materials 10 are in contact with each other through the height adjuster 120, (10) is pushed up from the bottom to maximize the area in contact with each other.

6 is a view illustrating a state in which the height of the base material is adjusted through the height adjuster according to the embodiment of the present invention.

6, a second slide bar 121-2 according to an embodiment of the present invention includes a first slide bar 121-2 passing through a slot S of a stage 20 formed at a position adjacent to a welding line, 2 The height of the cut surface of the second base material 10-2 can be adjusted to the height of the first base material 10-1 by pushing up the base material 10-2. The slots S may be formed in the stage 20 in the direction of the cut surface of each base material.

At this time, the second slide bar 121-2 can be raised by driving the second motor 122-2, and the height of the cut surface of the second base material 10-2 fixed on the stage 20 can be adjusted .

For example, the second slide bar 121-2 has a rack in a vertical direction at the bottom and at least one second pinion 123-2 that is rotated by the second motor 122-2 And can transmit the rotational force to the rack to move up and down.

At this time, the second motor 122-2 may be configured as a bi-directional motor.

That is, the second motor 122-2 rotates in one direction according to the control signal to raise the second slide bar 121-2 or rotate in the other direction to lower the second slide bar 121-2 .

A second displacement sensor 130-2 for measuring the vertical displacement of the rack (i.e., the slide bar) is formed below the second slide bar 121-2.

The second displacement sensor 130-2 may measure the vertical movement displacement of the second slide bar 121-2 in accordance with the rising or falling of the second slide bar 121-2 and transmit it to the controller 150. [

The second displacement sensor 130-2 may be a laser displacement sensor to measure the vertical movement displacement of the second slide bar 121-2, but the present invention is not limited thereto, and may be applied to various known sensors for measuring linear displacement This is possible.

In the above description, it is assumed that the height of the second base material 10-2 is adjusted. However, when the height of the first base material 10-1 symmetrical to the first base material 10-1 needs to be changed, And redundant descriptions are omitted.

Meanwhile, the controller 150 may control the overall operation for butt welding between the base materials according to the embodiment of the present invention, and may be composed of a computer including hardware and software or an electronic equipment equivalent thereto.

When the base material 10 for butt welding is seated and fixed on the stage 20, the controller 150 calculates the vertical distance information d1 (d1, d2) from the laser sensor unit 110 to the base materials 10-1, , d2).

The controller 150 calculates an average value of the total lengths (widths) of the respective base materials based on the vertical distance information d1 and d2 collected by the laser sensor unit 110 and determines the allowable distance within a predetermined step range So that the step is corrected and the welding is performed.

At this time, the controller 150 can calculate the difference in thickness and thickness of each base material, and calculate the allowable distance within the step difference range for adjusting the height of the combined two base materials in consideration of the thickness difference.

Further, the controller 150 calculates the step difference correction amount for the rise of the slide bar 121 in consideration of the displacement of the upper surface of the base material, which is increased or decreased according to the bent state

That is, the controller 150 calculates the height difference between the two parent materials facing each other based on the vertical distance information d1 and d2 collected by the laser sensor unit 110, It is judged that the step difference correction is necessary when the allowable distance within the step difference range is calculated.

Then, the controller 150 calculates the displacement of the corresponding slide bar 121 of the base material 10 having a relatively large vertical distance (i.e., a low height) among the two base materials to correct the step difference.

Here, the floating slide bar 121 refers to the slide bar 121 corresponding to the base material 10, which is relatively far from the laser sensor unit 110 by a vertical distance. For example, referring to FIGS. 5 and 6 (D1 < d2) that is relatively farther away from the center of the second slide bar 121-2.

For example, FIG. 7 shows a state in which height adjustment is not necessary since the vertical distance between two base materials is within a permissible distance with CASE # 1 according to the embodiment of the present invention.

7, a first base material 10-1 and a second base material 10-2 having different thicknesses are positioned on the stage 20 horizontally.

First, the controller 150 reads the first and second base materials 10-1 and 10-2 from the total vertical distance (20 mm) from the laser sensors 110-1 and 110-2 to the upper surface of the stage 20, (18.8 mm, 19.3 mm) obtained by subtracting the thickness (1.2 mm, 0.7 mm) of the laser sensors 110 - 1 and 110 - 2 from the laser sensors 110 - 1 and 110 - 2 coincides with the vertical distances d 1 and d 2 It can be determined that the upper surfaces of the two base materials 10 are all aligned on the stage 20 in parallel.

In addition, since the vertical distance d2 (19.3 mm) is longer than d1 (18.8 mm), the controller 150 determines that the second base material 10-2 having a relatively low height is a height adjustment object, The allowable distance (18.8 to 19.3 mm) within the height-adjustable step range by the thickness difference (0.5 mm) according to the combination of the thicknesses.

At this time, the controller 150 determines that the height d2 (19.3 mm) of the second base material 10-2 is within the allowable range (18.8 ~ 19.3 mm) The welding can be started after it is judged to be unnecessary.

On the other hand, FIG. 8 shows a state in which the vertical distance of the two parent materials exceeds the allowable distance by CASE # 2 according to the embodiment of the present invention and the height needs to be adjusted.

Referring to FIG. 8, the first base material 10-1 and the second base material 10-2 are not parallel but staggered from each other under the same conditions as those of FIG.

First, the controller 150 obtains a value obtained by subtracting 1.2 mm of the thickness of the first base material 10-1 from 20 mm of the vertical distance from the first laser sensor 110-1 to the upper surface of the stage 20, The measured d1 value is 18.5 mm, and the vertical distance on the upper surface of the first base material 10-1 is calculated to be 0.3 mm less than the base material thickness 1.2 mm.

The controller 150 has a value obtained by subtracting 0.7 mm of the thickness of the second base material 10-2 from a vertical distance of 20 mm from the second laser sensor 110-2 to the upper surface of the stage 20, The vertical distance d2 of the upper surface of the second base material 10-2 measured is 19.6 mm and the value of d2 is calculated to be 0.3 mm more than the base material thickness of 0.7 mm.

At this time, the controller 150 can grasp whether the base material is bent upward or downward based on the decreased or increased value of the d1 and d2 values considering the vertical distance from the laser material to the base material and the thickness of the base material. have.

Further, since the vertical distance of d2 (19.6 mm) is longer than d1 (18.5 mm), the controller 150 judges that the second base material 10-2 whose height is relatively low is regarded as a height adjustable object do.

In addition, the controller 150 calculates the allowable distance from 19.0 mm to 18.5 mm for adjusting the height of the second base material 10-2 in consideration of the thickness difference (0.5 mm) between the two base materials.

Specifically, the controller 150 subtracts the vertical distance decrease (0.3 mm) of d1 and the vertical distance increment (0.3 mm) of d2 from d2 (19.6 mm) of the second base material 10-2 to 19.0 mm, The minimum allowable distance of the base material 10-2 is set, and the maximum allowable distance is set to be adjustable up to 18.5 mm by applying a range of 0.5 mm, which is the difference in thickness between the two base materials 10-1 and 10-2. .

At this time, since the vertical distance of the second base material 10-2, which is the object of height adjustment, is 19.6 mm, the controller 150 does not exist within the calculated allowable distance (18.5-19.0 mm) It is possible to calculate the step correction amount for the rise of the second base material 10-2.

The controller 150 increases the height of the second slide bar 121-2 corresponding to the second base material 10-2 through the step correction amount to adjust the height of the second base material 10-2 to the allowable distance 18.5 ~ 19.0).

For example, the controller 150 sets the height correction amount of the second slide bar 121-2 to 0.85 mm, which is 0.6 mm obtained by adding the decrease of d1 and the increment of d2 at 19.6 mm of d2 and the intermediate value of 0.25 mm, mm.

On the other hand, the butt welding method according to the embodiment of the present invention based on the configuration of the butt welding apparatus 100 described above will be described with reference to FIG.

9 is a flowchart schematically illustrating a butt welding method according to an embodiment of the present invention.

9, the welding apparatus 100 according to the embodiment of the present invention includes a first base material 10-1 and a second base material 10-2 Are transferred, they are fixed through grips (S101).

The vertical distance d1 between the upper surface of the first base material 10-1 and the second base material 110-2 through the laser sensors 110-1 and 110-2 disposed on the upper portions of the respective base materials, The vertical distance d2 from the upper surface of the wafer W is measured (S102). At this time, the laser sensors 110-1 and 110-2 are mounted on the welder 140 and can measure the d1 and d2 while moving along the welding line (welding path) before starting the welding.

The welding apparatus 100 calculates an average vertical distance to the entire width of each base material based on the measured d1 and d2 (S103). At this time, the welding apparatus 100 compares the average vertical distances based on d1 and d2, and determines that the base material existing at a lower position due to the relatively longer average vertical distance is a height adjustable object.

The welding apparatus 100 calculates and sets the allowable distance within the step difference range so that the cut surfaces of the two base materials can be brought into contact with each other as much as possible in consideration of the difference in thickness and thickness of the base material to be combined (S104). At this time, the welding apparatus 100 can calculate the allowable distance within the step difference range, considering the displacement of the upper surface of the base material, which is increased or decreased according to the bent state of at least one base material.

If the average vertical distance of the base material in a relatively low position does not exist within the set allowable distance, the welding apparatus 100 determines that a step has occurred in the area of contact between the cut surfaces of the two base materials (S105;

The welding apparatus 100 calculates a step difference correction amount of the slide bar 121 for raising the upper surface of the base material at a relatively low position within the allowable distance (S106). At this time, the step correction amount may be calculated such that the upper surface of the base material is located at the middle value of the allowable distance.

The welding apparatus 100 drives the motor 122 to raise the slide bar 121 and measures the vertical movement displacement of the slide bar 121 through the displacement sensor 130 in step S107.

The welding apparatus 100 stops the driving of the motor 122 when the measured vertical movement displacement reaches the step correction amount (S108), transfers the welding control signal to the welding machine 140, and performs welding (S109) .

On the other hand, if it is determined in step S105 that the average vertical distance of the base material in a relatively low position is within the allowable distance within the step difference range (S105; YES), the welding area of the two base materials is optimized The welding can be started immediately (S109).

As described above, according to the embodiment of the present invention, it is possible to correct the step difference between the base materials so that the contact area between the two base materials fixed on the stage becomes maximum, and to sufficiently weld the weld surface, There is an effect.

In addition, by using the laser sensor, the allowable distance within the step range according to the combination of the different base materials with different thicknesses or different bending states is calculated, and the defects between the base materials are corrected based on this, Thereby reducing the loss of the base material and improving the performance of mass-produced products.

In addition, by calculating the step difference correction amount between the base materials based on the average vertical distance considering the entire width of the base material, it is possible to perform the welding with the minimum step within the allowable range even if the height difference in the width direction of the base material occurs have.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

10: base material 20: stage
30: grip 100: welding device
110: laser sensor unit 120: height adjuster
121: Slide bar 122: Motor
123: Pinion 130: Displacement sensor
140: Welding machine 150: Controller

Claims (15)

A butt welding apparatus for welding two base materials against each other with a stage on which a base material is placed on both sides and a grip for fixing the base material on each stage,
A laser sensor unit for measuring a vertical distance between the first base material and the second base material respectively fixed to the stage;
A height adjuster for adjusting the height by pushing the base material from the bottom through the slide bar; And
A controller for controlling the vertical movement displacement of the slide bar and controlling the butt welding through the welder to correct a step according to the distance measurement between the first base material and the second base material;
A butt welding device. The method according to claim 1,
The laser sensor unit
A butt welding apparatus comprising a first laser sensor and a second laser sensor for measuring the distance from each base material by irradiating a laser onto an upper surface of a base material and detecting a reflected signal. 3. The method of claim 2,
The first laser sensor and the second laser sensor
A butt welding device installed side by side on both sides of the welding machine moved along the welding line at regular intervals. The method according to claim 1,
The height adjuster
The slide bar;
A motor for applying a rotational force to the rack formed at a lower portion of the slide bar through a pinion; And
A displacement sensor for measuring a vertical displacement of the slide bar;
A butt welding device. The method according to claim 1 or 4,
The slide bar
A butt welder for pushing up the base material through a slot on the stage formed at a position adjacent to a welding line from below. 5. The method of claim 4,
The displacement sensor
And a vertical movement displacement of the slide bar measured through a laser is transmitted to the controller. 5. The method of claim 4,
The controller
A butt welder for calculating an average vertical distance of each of the base materials based on a vertical distance between the first base material and the second base material adjacent to the welding line. 8. The method of claim 7,
The controller
A step of driving the motor by calculating a step correction amount for raising the base material relatively far from the average vertical distance and stopping the motor when the vertical movement displacement of the slide bar measured by the displacement sensor reaches the step correction amount, Welding apparatus. 9. The method of claim 8,
The step difference correction amount
Wherein the average distance of the relatively far away base material is calculated to be located at a permissible distance within the step difference range which is set by a combination of two base materials in consideration of the difference in thickness and the bent state of the first base material and the second base material. A butt welding method of a butt welding apparatus having a stage on which a base material is placed on both sides and a grip for fixing a base material on each stage,
a) measuring a vertical distance from a top surface of the first base material and the second base material, which are seated on the stage via the laser sensor portion, respectively;
b) determining the height of the second base material that is relatively far from the average vertical distance by calculating an average vertical distance to the entire width of the base material based on the measured vertical distance;
c) setting an allowable distance within a step range in which the cut surfaces of the two base materials abut each other considering the thickness and thickness difference of the base material; And
d) if the average vertical distance of the second base material is not within the allowable distance, controlling the vertical movement displacement of the slide bar to push up the second base material from the bottom, so that the average vertical distance of the second base material is within the allowable distance Correcting to be located;
Wherein the butt welding method comprises: 11. The method of claim 10,
The step a)
And measuring the vertical distance while moving the laser sensor part mounted on the welder along the weld line. 11. The method of claim 10,
The step c)
Calculating the allowable distance within the step difference range by further considering the average vertical distance which is increased or decreased according to a state in which at least one base material is curved. 11. The method of claim 10,
The step d)
And calculating a step correction amount of the slide bar for raising the average vertical distance of the second base material to be at a middle value of the allowable distance. 14. The method of claim 13,
The step d)
Driving a motor to raise the slide bar and measuring a vertical displacement of the slide bar through a displacement sensor. 15. The method of claim 14,
The step d)
And stopping the drive of the motor when the vertical movement displacement reaches the step correction amount, and transmitting the welding control signal to the welder to start welding.

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